Blockchain cross-chain data access learning guide

Blockchain cross-chain data access learning guide

Glossary

Term definition Blockchain is a peer-to-peer network system implemented by nodes using a consensus mechanism, with a distributed data storage structure. Multi-chain system is a system composed of multiple different blockchains, and blockchains can interact with each other. Target data is stored in the target blockchain, and needs to be accessed and operated. Operation request contains request information for performing operations on target data, such as getting, writing, etc. Node Participants in the blockchain network can initiate transactions, verify transactions, store data, etc. URL Uniform resource locator used to locate and access target data. Access path indicates the location information of target data in the multi-chain system, such as blockchain ID, data node identifier, etc. Data node Data storage unit, such as transaction or block. Data block created and published to the blockchain by transaction users using blockchain clients. Block contains multiple data blocks of transaction data, which are linked in chronological order to form a blockchain. Data node domain records information about the area where the access path node is located, such as the identification information of the target blockchain. Data node identifier records identification information of the access path node, such as transaction hash value or block hash value. Data node path records path information for traversing and accessing target data starting from the access path node. Operational semantics records the operational semantics information of the operations performed on the target data, such as getting, writing, etc. Protocol The name of the blockchain protocol, such as Bitcoin, Ethereum, etc. Instance The name of the blockchain instance that supports the blockchain protocol. Retrieval space is the index space used to query the target data, such as the transaction hash map or the block hash map. Access link The link to the next data node, used to jump in the multi-chain system.

Short answer question

What is a blockchain multi-chain system?

What is the role of the URL in cross-chain data access?

What role does the access path play in cross-chain data access?

What types of data nodes are there? What do they store respectively?

How to understand the concept of data node domain?

How does the data node identifier uniquely identify a data node?

What information does the data node path contain?

What is the format of the operational semantics field?

How to understand the concepts of blockchain protocol and blockchain instance?

What is the role of the retrieval space?

Short answer question answer

A blockchain multi-chain system is a system composed of multiple different blockchains that can interact with each other, such as a main chain-child chain architecture or a parallel multi-chain architecture. The URL is used to locate and access the target data. It contains the location information of the target data in the multi-chain system, such as the blockchain ID, data node identifier, etc.

The access path indicates the location information of the target data in the multi-chain system. The blockchain and data node where the target data is located can be found through the access path.

Data nodes are divided into transaction type data nodes and block type data nodes. Transaction type data nodes store transaction content, and block type data nodes store block information, such as block hash value, timestamp, transaction list, etc.

The data node domain records the information of the area where the access path node is located, such as the identification information of the target blockchain, which is used to indicate the blockchain where the data node is located.

The data node identifier can use the transaction hash value or block hash value to uniquely identify a data node, or other identification information, such as the serial number of the transaction in the block.

The data node path contains the path information for traversing and accessing the target data starting from the access path node, such as the link name, attribute information, etc.

The format of the operation semantic field can be "[?] [op=[get|put|<content operation>]] [[&]<other parameters><parameter value>]*", such as "op=get-tx&tx-index=10" or "op=put-tx".

Blockchain protocol refers to the underlying protocol of blockchain, such as Bitcoin, Ethereum, etc. Blockchain instance refers to the specific blockchain network that supports blockchain protocol, such as Bitcoin mainnet, Ethereum testnet, etc.

The retrieval space is used to provide range support for data retrieval, such as transaction hash mapping table, block hash mapping table, etc., and the target data node can be quickly located through the retrieval space.

Essay question

Please explain the concept of blockchain cross-chain data access in detail and explain its significance in practical applications.

Try to compare and analyze different cross-chain data access methods, such as hash value-based addressing method and RESTful-style access path method.

Please design an application scenario for cross-chain data access and explain in detail how to implement the scenario using the technical solutions mentioned in the learning materials.

Please explore the challenges and future development directions of blockchain cross-chain data access technology.

Please analyze and evaluate the advantages and disadvantages of this cross-chain data access solution based on the learning materials, and put forward suggestions for improvement.